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| -rw-r--r-- | Documentation/btrfs-image.txt | 7 | ||||
| -rw-r--r-- | btrfs-image.c | 3 |
2 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/btrfs-image.txt b/Documentation/btrfs-image.txt index b7751f90..38265171 100644 --- a/Documentation/btrfs-image.txt +++ b/Documentation/btrfs-image.txt @@ -13,8 +13,13 @@ DESCRIPTION ----------- *btrfs-image* is used to create an image of a btrfs filesystem. All data will be zeroed, but metadata and the like is preserved. +Mainly used for debugging purposes. + +In the dump mode, source is the btrfs device/file and target is the output +file (use '-' for stdout). + +In the restore mode (option -r), source is the dumped image and target is the btrfs device/file. -Mainly used for debug purpose. OPTIONS ------- diff --git a/btrfs-image.c b/btrfs-image.c index cb17f161..1341bf1f 100644 --- a/btrfs-image.c +++ b/btrfs-image.c @@ -2466,6 +2466,9 @@ static void print_usage(void) fprintf(stderr, "\t-s \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n"); fprintf(stderr, "\t-w \twalk all trees instead of using extent tree, do this if your extent tree is broken\n"); fprintf(stderr, "\t-m \trestore for multiple devices\n"); + fprintf(stderr, "\n"); + fprintf(stderr, "\tIn the dump mode, source is the btrfs device and target is the output file (use '-' for stdout).\n"); + fprintf(stderr, "\tIn the restore mode, source is the dumped image and target is the btrfs device/file.\n"); exit(1); } |